Grinding machine



May 10, 1949. K. w. J. HJELMBLAD GRINDING MACHINE 2 Sheets-Sheet 1.

Filed Feb. 14, 1945 M y K. w. J. HJELMBLAD' 2,469,770

GRINDING MACHINE Filed Feb. 14, 1945 2 Sheets-Sheet 2 Patented May 10, 1949 UNITED PATENT OFFICE ZZZCHIN E AppIicat'ion' February-M, 1945,SerialNo. 577,739 In'Sweden Marclr i,- 1944 3 Claims. (01. 51-166) The. present invention-relates to? grinding ina- .chines vfor grinding or sharpening, .for instance, of cutting toolssuch as cutters, reamers, boring and forming tools-and. screw taps.

The primary objectwaf'theinventionv is'to arrange theheadstock of a grindihg'machine'on a Substructure in such amanner that the grinding tool may beadjusted-to thedesiredangle at anydesire'd point within the working range of the machine.

A further object-of the-invention is to provide a simple and compact combination of a head stock and a substructure of'a-grinding machine'and of means carrying saidhead stock on the substructure and enabling indication of the angular position of the head stock relatively to th'e'c'arrying means and of said means relatively to the substructure so as to allow exact control of the position of the grinding tool after an adjustment thereof.

The inventionwill beexplainedwith reference to a typical embodiment as illustrated in the accompanying drawings, wherein Fig. '1 is a front view of the head stock .of atool grinding machine in its zero position and of the parts carrying the headstock. Fig, 2 is'a corresponding end view and Fig. 3 a corresponding planview. Fig. 4 is a correspondingplan viewbut with the various parts in other positions relatively to the substructure. I v Fig.5 is a vertical section' ori the broken'line V-V in Fig. 1 and illustrates details of locking means; and Fig.--6 is a perspective detail of" the rotatably adjustable-bed plate of the machine.

In the drawings, I designates a standard which is vertically displaceable in a substructure I, said standard having an intermediate circular bed plate 2 guided by a vertical pin 2a which is j-ournalled in a central bore 2b in the standard. The plate 2 is mounted to be rotated about the pin relatively to the standard in the horizontal plane, the angular position of the plate relatively to the standard being indicated by means of a graduation 3 cooperating with a zero index 4 on the standard I. If desired, the graduation may be provided on the standard and the zero index on the intermediate plate. The pin is extended through a hole in the plate 2 into a longitudinal T-shaped undercut groove in the bottom of a slide 6, the latter being supported upon bed plate 2 and slidable transversely on complementary ways formed by a horizontal T-shaped guide rib 2' extending across the top face of plate 2 as shown in Fig. 6, and which is received in a snug sliding fit in the T-shaped groove 5. The rib 2' clamp the latter-to the standard I.

is interrupted at the central portion of plate 2 to permit passage of the pin 2a. A head 20 formed at the top end of the pin 2a rests upon the longitudinally extending internal shoulder 6a formed in the body of slide :5 by the T grooves :5. Downwardpressureexerted by the head 20 on the shoulder- 6a as the pin 2a is pulled downward will thus clamp the slide 6 to the bed plate 2 and also The slide in turn carries a head stock I mounted to be rotated thereon in a horizontal plane, afurther pin la being fitted in a vertical bore 5b in the bottom'of said head stock. The pin it has its head fitted into a circular cavity in the top of the'T-groove 5. The head stock carries, in a known manner, the driving motor 8 and a horizontal grinding disk spindle I0 driven by (or directly coupled to) said driving motor by means of a driving belt 9, for example, a grinding disk II being secured to said spindle I t.

Theangular position of the head stock I relatively to theslide 6 is marked by means of a graduation. This graduation may consist of a grade or line division I2 on the head stock '3 and of a zeroline I3 on the slide'fi to cooperate with said graduation, or of a grade or line division on the slideto cooperate with a zero line on the head stock. If" desired, the slide 6 may be provided with a gradeor line division cooperating with a zero line on the intermediate plate.

The head stock is adapted to be looked in the desired angu-lar'position by means of a handle I4 on a shaft I la journalled in the headstock and extending into a transverse aperture I4b withitseccentric end portion I 40. In a similar manner the intermediate plate 2 and the slide 6 may be locked to the standard in the desired angular position and position of displacement, respectively, as explained above by means of another handle I5 having a shaft with an eccentric end portion I5a extending into a transverse aperture I5b in the pin 2a.

If the intermediate plate 2 is turned on the standard I, the slide 6 will also be swung together with the head stock I. The shaft ID of the grinding disk then deviates from the initial position by the same number of degrees by which the intermediate plate has been turned. Now, the head stock may be turned back by the same number of division lines by which the intermediate plate was turned, whereupon the shaft is brought back into the initial position or into a position paralleling the same. Furthermore, the head stock and the slide may be displaced in the horizontal plane. Consequently, the head stock may geously so arranged that the same or a simple Y number of scale divisions (number of grades of a graduation) may be read off on both as a measure of the relative turning movements then produced. Hereby, it will be possible at the adjustment of the head stock to control in a simple manner whether the axis of rotation of the grinding disk has altered its direction during the adjustment, it being then possible to efiect the requisite correction, if the direction is to be maintained, or to efiect an adjustment into a certain desired angular position, if such would be called for.

The advantages of the above mentioned construction are the following, inter alia: The grinding disk may be adjusted into the desired position relatively to the working table of the grinding machine or to the tool to be ground, in accordance with the whole longitudinal and transverse movement of the working table. Since the head stock is displaceable relatively to the standard, a greater working range will thus be obtained relatively to the longitudinal and transverse feed of the machine than if the head stock were only rotatable about the standard. A readily and quickly effected adjustment of the grinding disk is rendered possible by reason of scale divisions serviceable for the purpose in view.

What I claim is:

1. In a grinding machine, a vertical standard having an axial bore, anintermediate circular plate supported atop said standard and concentric therewith, a slide on said plate, said slide having an axially extending undercut groove at its lower face and which cooperates with a diametrally extending complementary rib on said plate for guiding said slide longitudinally of the groove axis, a pin having an enlarged head portion seated on the undercut portion of said groove and which extends axially through said plate into the bore in said standard to provide a journal about which said plate and slide may be rotated as a unit, locking means mounted in said standard and engaging said pin for effecting downward axial movement thereof to clamp said slide and plate to said standard in a selected position of displacement and angular position, respectively, a head stock for a grinding tool, means mounting said head stock on said slide for angular adjustment about a vertical axis, and graduated scale and index means carried by said plate and standard and also by said slide and head stock for indicating the respective angular relations therebetween. 2. In a grinding machine, the invention as recited in claim 1, wherein said mounting means comprises a pin having an enlarged head seated in a recess in the base of the groove of said slide, said pin extending into a bore in said head stock, and clamping means mounted in the head stock for cooperation with said pin to lock the head stock in the desired adjusted position.

'3. In a grinding machine, a vertical standard having an axial bore, an intermediate plate supported atop said standard, a slide atop said plate and non-rotatable with respect thereto, said slide having at its lower face a horizontally extending T groove the axis of which coincides with the vertical axis of said standard and plate and being displaceable along said groove axis, a pin having an enlarged head portion seated in said groove and which extends axially through said intermediate plate into the bore in said standard to provide a journal about which said plate and slide may be rotated as a unit, locking means mounted in said standard and engaging said pin for efiecting downward axial movement thereof to clamp said slide and plate to said standard in a selected position of displacement and angular position, respectively, a head stock for a grinding tool, means mounting said head stock on said slide for angular adjustment about a vertical axis, and graduated scale and index means carried by said plate and standard and also by said slide and head stock for indicating the respective angular relations therebetween.

KARL WILHELM JOSEF HJELMBLAD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 587,737 Van Norman Aug. 3, 1897 1,326,423 Rennie Dec. 30, 1919 1,752,961 Oliver Apr. 1, 1930 2,182,231 Le Blond Dec. 5, 1939 

